Origin of the laser-induced picosecond spin current across magnetization compensation in ferrimagnetic GdCo

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI:arxiv-2409.03088

Guillermo Nava Antonio, Quentin Remy, Jun-Xiao Lin, Yann Le Guen, Dominik Hamara, Jude Compton-Stewart, Joseph Barker, Thomas Hauet, Michel Hehn, Stéphane Mangin, Chiara Ciccarelli

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Abstract

The optical manipulation of magnetism enabled by rare earth-transition metal ferrimagnets holds the promise of ultrafast, energy efficient spintronic technologies. This work investigates laser-induced picosecond spin currents generated by ferrimagnetic GdCo via terahertz emission spectroscopy. A suppression of the THz emission and spin current is observed at magnetization compensation when varying the temperature or alloy composition in the presence of a magnetic field. It is demonstrated that this is due to the formation of domains in the GdCo equilibrium magnetic configuration. Without an applied magnetic field, the picosecond spin current persists at the compensation point. The experimental findings support the model for THz spin current generation based on transport of hot spin-polarized electrons, which is dominated by the Co sublattice at room temperature. Only at low temperature a comparable contribution from Gd is detected but with slower dynamics. Finally, spectral analysis reveals a blueshift of the THz emission related to the formation of magnetic domains close to magnetization compensation.

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铁磁性钆钴中激光诱导的皮秒自旋电流跨磁化补偿的起源

稀土过渡金属铁磁体对磁性的光学操纵为超快、高能效的自旋电子技术带来了希望。这项工作通过太赫兹发射光谱研究了铁磁性钆钴合金产生的激光诱导皮秒自旋电流。在磁场存在的情况下，当改变温度或合金成分时，会观察到太赫兹发射和自旋电流在磁化补偿时受到抑制。研究表明，这是由于在钆钴平衡磁构型中形成了磁畴。实验结果支持基于热自旋极化电子传输的太赫兹自旋电流产生模型，该模型在室温下由钴亚晶格主导。只有在低温条件下，才能检测到来自钆的类似贡献，但其动力学速度较慢。最后，光谱分析揭示了太赫兹发射的蓝移，这与接近磁化补偿的磁畴的形成有关。

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arXiv - PHYS - Applied Physics

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